Treat the x*1 generated by parsing a unary + as containing a dot.

Treat the x*1 generated by parsing a unary + as containing a dot.

Since we convert +x to x*1, we loose information about whether
the 1 was intended to be a floating point value for asm.js or not.

Mark the generated 1 as containing a dot (i.e. 1.0).

BUG= https://code.google.com/p/v8/issues/detail?id=4203
TEST=test-parser
R=rossberg@chromium.org,titzer@chromium.org
LOG=N

Review URL: https://codereview.chromium.org/1306683003

Cr-Commit-Position: refs/heads/master@{#30481}